Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

The Master node originates a high-speed frame that circulates around the ring. This frame, appropriately, sets up or breaks down the ring.

• The Master node transmits ring status check frames at specified intervals.
• You can run multiple physical rings on the same switch.
• One Master node per ring — all other nodes are Transit.
• Each node has two member interfaces — primary and secondary.
• There is no limit to the number of nodes on a ring.
• Master node ring port states — blocking, pre-forwarding, forwarding, and disabled.
• Transit node ring port states — blocking, pre-forwarding, forwarding, and disabled.
• STP disabled on ring interfaces.
• Master node secondary port is in blocking state during Normal operation.
• Ring health frames (RHF)
  • Hello RHF: sent at 500ms (hello interval); Only the Master node transmits and processes these.
  • Topology Change RHF: triggered updates; processed at all nodes.